Thanks!
I would not consider leaving anything liquid on the machine. A wipe-down is only going to affect the outside while at this point I'm thinking the smoke odor is coming from the interior more than exterior.
So far, I'm thinking that charcoal and/or baking soda in an enclosed box are the safest ideas. If I knew 100% that there was no way an open dish/cup/glass of vinegar wouldn't get spilled, I'd try that in the box. However, having a 4 year old and a min-pin in the same house makes me think more than twice about trying it! ;-)